Method for manufacturing cylindrical members and method for manufacturing motors having the cylindrical member

Inactive Publication Date: 2007-04-03
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]An object of the present invention is to provide a method for manufacturing a cylindrical member that is superior in accuracy and an annular member such as a magnet can be fixed or secured to an inner circumference surface or an outer circumference surface thereof, and a method for manufacturing a motor having the cylindrical member.
[0010]In addition, another object of the present invention is to provide a method for manufacturing a cylindrical member that can be produced at a low cost and is superior in dimension stability and reliability, and a method for manufacturing a motor having the cylindrical member.
[0011]Furthermore, another object of the present invention is to improve reliability of a motor having a cylindrical member as a yoke.
[0014]The cylindrical member of the present invention can be finished precisely concerning the dimension in the axial direction because the end portion of the cylindrical member is cut. An annular groove is provided on an outer circumference surface of the cylindrical member to which the annular member is fixed or secured, so a burr is housed in an annular groove even if the burr is formed in the cutting step. Therefore, the burr does not become an obstacle when fixing or securing the annular member.

Problems solved by technology

As a result, it is difficult to make the dimension of the molded member S in the axial direction at a fine accuracy.
However, the additional process for removing a burr in the conventional method as described above may increase the number of manufacturing steps and a production cost.
In addition, the method of cutting the outward end portion in the radial direction of the molded member in the axial direction is difficult to apply to a small and low profile type of motor that uses the molded member as a yoke.
However, if the yoke is cut in the axial direction, a burr is formed in the axial direction, and a distortion and the like is formed at the opening end portion of the yoke due to the shearing force for cutting.
As a result, a dimension of the yoke in the axial direction cannot be finished precisely.
As a result, the position detection means such as a Hall element cannot detect a magnetic flux of the magnet, and reliability of the motor is deteriorated.

Method used

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  • Method for manufacturing cylindrical members and method for manufacturing motors having the cylindrical member
  • Method for manufacturing cylindrical members and method for manufacturing motors having the cylindrical member
  • Method for manufacturing cylindrical members and method for manufacturing motors having the cylindrical member

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Embodiment Construction

[0038]Hereinafter, a motor according to one embodiment of the present invention will be described with reference to the attached drawings. FIG. 1 is a cross section in the axial direction of a motor according to an embodiment of the present invention, and FIG. 2 is an A—A cross section of the motor shown in FIG. 1. However, peripheral members such as a rotation shaft and a winding are omitted in FIG. 2. Note that though the vertical direction in each drawing is referred as the “vertical direction” in the description of an embodiment of the present invention for convenience, it does not limit the direction in the real mounted state.

[0039]A motor 1 includes a cylindrical housing 2 that has a small opening portion 2a formed upward in the axial direction and a large opening portion 2b formed downward in the axial direction and being larger than the small opening portion 2a, a stator 3 that is fixed to an inner circumference surface of the housing 2, a circuit board 6 that is attached to...

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Abstract

A magnet (10) that is an annular member is fixed or secured on an outer circumference surface or an inner circumference surface of a yoke (4) that is a cylindrical member. An lower end surface in the axial direction of the magnet is fixed or secured to the same plane as a lower end surface in the axial direction of the yoke (4), or the lower end surface in the axial direction of the magnet is fixed or secured so as to protrude a little from the lower end surface in the axial direction of the yoke. An annular groove (4a) that is recessed outward in the radial direction or inward in the radial direction is formed on a part of the outer circumference surface or the inner circumference surface that is continuous to the yoke (4).

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The disclosure of Japanese Patent Application No. 2003-120826 filed Apr. 25, 2003 including specification, drawings and claims is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to a method for manufacturing a cylindrical member having an annular member that is fixed to an outer circumference surface or an inner circumference surface thereof. The method can be used particularly suitably for a motor that includes this cylindrical member.BACKGROUND OF THE INVENTION[0003]As a conventional motor, there is a known structure in which a magnet is fixed to an inner circumference surface or an outer circumference surface of a cylindrical yoke, and a stator is arranged to face the yoke so that the yoke and the stator rotate relatively to each other by a magnetic field that is generated between the magnet and the stator.[0004]As this type of motor for example, there is an outer rotor type mot...

Claims

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Application Information

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IPC IPC(8): B21K1/40H02K1/22H02K1/17H02K1/27H02K5/04H02K15/02H02K15/03H02K15/14
CPCH02K1/17H02K1/2733H02K1/2786H02K5/04H02K15/14H02K15/03Y10T29/49009Y10T29/49533Y10T29/49536Y10T29/49012H02K1/2791
InventorFUJII, YOSHIOYAMADA, YOSUKEOTAGAKI, AKIRA
OwnerNIDEC CORP